15 /* to be found in fpu.S */
25  * using a va_list as va_start() always copy the FPU registers that could be
26  * used to pass float arguments, and that triggers an FPU access trap.
64  * Flush FPU content and disable access.
76 		/* turn on FPU access */  in arch_flush_local_fpu()
88 		/* disable FPU access */  in arch_flush_local_fpu()
112 			/* the FPU context is live on another CPU */  in flush_owned_fpu()
126 			 * two CPUs want to pull each other's FPU context.  in flush_owned_fpu()
144 	/* always deny FPU access whenever an exception is entered */  in z_arm64_fpu_enter_exc()
150  * Simulate some FPU store instructions.
152  * In many cases, the FPU trap is triggered by va_start() that copies
156  * FPU access is disabled and we're trapped while in exception context.
157  * Rather than flushing the FPU context to its owner and enabling access
159  * simulate them and leave the FPU access disabled. This also avoids the
166 	 * We know there is no saved FPU context to check nor any  in simulate_str_q_insn()
211  * Process the FPU trap.
217  * is always disabled by default in that case. If so we save the FPU content
218  * to the owning thread and simply enable FPU access. Exceptions should be
233 	/* turn on FPU access */  in z_arm64_fpu_trap()
249 		 * We were already in exception when the FPU access trap.  in z_arm64_fpu_trap()
252 		 * interrupted exception's FPU context.  in z_arm64_fpu_trap()
260 	 * Make sure the FPU context we need isn't live on another CPU.  in z_arm64_fpu_trap()
261 	 * The current CPU's FPU context is NULL at this point.  in z_arm64_fpu_trap()
275  * Perform lazy FPU context switching by simply granting or denying
276  * access to FP regs based on FPU ownership before leaving the last
280  * first access and then the actual FPU context switching will occur.
291 			/* turn on FPU access */  in fpu_access_update()
294 			/* deny FPU access */  in fpu_access_update()
299 		 * Any new exception level should always trap on FPU  in fpu_access_update()
318  * This is called from z_arm64_context_switch(). FPU access may be granted
320  * some exception context then FPU access would be re-evaluated at exception